24642

Appears in sequences

• a(n) = n*(n+1)^2/2.at n=36A006002
• Palindromes whose sum of divisors is odd.at n=12A028984
• Nonsquare palindromes whose sum of divisors is odd.at n=4A028985
• Palindromic and divisible by 9.at n=38A045644
• Palindromes with exactly 5 prime factors (counted with multiplicity).at n=32A046331
• Palindromic untouchable numbers.at n=36A048187
• Maximal value of Sum_{i=1..n} (p(i) - p(i+1))^2, where p(n+1) = p(1), as p ranges over all permutations of {1, 2, ..., n}.at n=41A064842
• Composite numbers k+1 such that k*phi(k+1) is a perfect square.at n=24A069068
• Numbers n for which there are exactly ten k such that n = k + reverse(k).at n=25A072434
• Expansion of (1-x)/(1-x+x^2-2*x^3).at n=40A078015
• Values of x for which 9*y^2 = x^2 + 2*x*y - 2*x has integer solutions with positive y.at n=4A083000
• a(n) = n*(2*n+1)^2.at n=18A084367
• Palindromes with more than 3 digits in which the absolute difference of a pair of successive digits is identical.at n=30A085109
• Palindromes in A085936.at n=12A085937
• Group the natural numbers such that the n-th group sum is divisible by the n-th triangular number: (1), (2, 3, 4), (5, 6, 7), (8, 9, 10, 11, 12), (13, 14, 15, 16, 17), (18, 19, 20, 21, 22, 23, 24), ... Sequence contains the group sum.at n=35A086500
• a(1) = 1; for n > 1, a(n) is the smallest number that is either a divisor or a multiple, in that priority (order), of a(n-1) such that it is a distinct palindrome not included earlier.at n=47A089337
• Least palindromic multiple of concatenation 1,2,3,...n-1,n,n-1,...3,2,1.at n=2A109930
• Palindromes equal to the sum of a prime number with its index.at n=36A115888
• Even refactorable numbers k such that the number r of odd divisors of k and the number s of even divisors of k are both odd divisors of k.at n=17A120361
• Numbers m such that m^k does not divide the denominator of the m-th generalized harmonic number H(m,k) nor the denominator of the n-th alternating generalized harmonic number H'(m,k), for k = 5.at n=5A128675